Drying-table.



W. R. MACKLINDL DRYING TABLE. APPLICATION FILED AUG-4, ms. 1 39,415., Patentedfiept. 4:, 1917 2- suzns-sncn 1.

CLD/TK/Egjfi w. R. MACKLIND.

DRYING TABLE.

APPLICATION man AUG-4, 191s.

Patented Sept. 1', 1917.

'mwttt 2 SHEETS-SHEET 2.

FTTOENEVG WILLIAM B.'1VIAGKLIND, OF CLEVELAND, OHIO.

DRYING-TABLE.

Specification of Letters Patent.

rammed Sept. a, rear.

Original application filed August 10, 1912, Serial No. 714,323. Divided and this application filed. August 4:, 1915. Serial No. 43,593.

To all whom it may concern:

Be it known that 1, WILLIAM R. Macn- LI'ND, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented anew and useful Improvement in Drying-Tables, of

which the following is a specification, the.

principle of the invention being herein explained and the best 'mode in which I have contemplated applyingthat principle, so as to distinguish it from other inventions.

The improved drying table which forms the subject matter of interest herein, is designed primarily for drying pulps, that is, wet, sludgy .materials, both in mineral and vegetable products. A pulp of the kind in mind is produced, for example, in the manufacture of white lead and lead oxid, zinc oxid and other pigments. All these materials when in the pulp state, are more or less refractoryboth in being subjected to drying means and in letting loose of a cer tain percentage of the water which they carry.

Such improved drying table constitutes part of a general drying mechanism which forms the subj ect matter of my co-p'end'ing application filed AugustlO, 1912, Serial No. 714,323, "out of which the present case has been required to be divide WVith the objectof rendering the drying process a continuous one, the table in question is of general annular form, the mechanism being arranged to supply the wet sludge, or pulp, in a continuous stream onto said table, and the dry, powdery product being similarly removed therefrom, In the design of said table I have sought to provide means whereby it may be heated uniformlythrouglrout its extent, both transversely and circumferentially, and to this end, preferably make the table of sectional construction, the supply of the heating medium to the several sections being independently regulable. A further objecthas been to maintain thestruc'ture as simple and compact as possible, and still accomplish the foregoing desired results. To such accomplishme'n't, the invention, then consists of the means hereinafter fully describedland particularly pointed out in theclaims.

The annexed drawings the following descriptionset forth-in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one a part shown in section in order to more clearly indicate the detailed construction of the same. i

The general features of construction characterizing the illustrative form of my improved mechanism, so far as shown in the foregoing drawings, comprise in addition to the annular drying table A proper, a feed .ing apparatus B for depositing onto said table a layer .or lilm of the material to be dried; an apparatus in the form of a hood, more or less co-extensive with said table for removing the vapor or moisture arising from the drying of such deposited material; and an apparatus C for removing from the table the dried material and discharging the same from the machine. Of the foregoing features, the only one which will be described in detail is the drying table, it being sufficient to explain that the several other mechanisms referred to, are supported by a rotatable frame including radial arms 16 and cross-members 17 and 18, (Flgs. 1 and 2), whiolrframe carries such parts in cooperatlve relatlon to the table, and also supstands 1 upon the foundation 2, (Fig. 2). l:

The table proper is built up of a plurality of contiguous sections that are supported upon said stands by means of inner and outer channel rings 3. The sections are in the form of sectors 1 and are hollow, the

upper and lower walls being connected together by webs 5, as shown in the figure just named. Pipes 6 and 7 for supplying steam and removing the Water of condensation, re-

spectively, areprovidedin connection with each sector, the last-named pipes being connected to the inner ends of the sectors and the bottom walls of the latter sloping toward such inner ends so as to cause the condensed water to drain naturally away. These pipes are radially disposed and are connected at their inner ends to circular headers 8 and 9, respectively. While a common steam supply source is thus provided, it will be observed that the amount of steam supplied to each sector is independently regulable, a valve o being included in each pipe 6, so that the temperature of the upper face of the assembled table may be regulated so as to vary at different points around the circle. Such upper face is designed to be smooth and polished and the sectors accurately oined together so that a practically uninterrupted surface is provided around the entire extent of the table.

While the size of the table, that is the area of its drying surface, will of course vary with the capacity desired, I have found it;

advantageous to preserve a certain relation between said tables inner and outer diameters in order to secure the best and most unif form drying results. It is accordingly recommended that the minimum ratio of the outside diameter to the inner diameter be as 1.8 to 1, and that the maximum ratio of such diameters be as 1.5 is to 1. Furthermore, in order that the material feeding and removing apparatus may operate well within the inner and outer edges 4? and r, respectively, of the table thus insuring against the escape of material over such edges, the latter are made to extend beyond the sides of the hollow heating-chambers so that the surface of the table will be flanked both on the inside and the outside, by a non-drying space.

The mode of use of the foregoing described drying table should not require any special description, In the machine in question, the rotatable frame, with the several apparatuses supported therefrom, moves in the direction indicated by the arrow in Fig. 1, so that, as fast as the dried material on the table is taken up and removed by mechanism C, a fresh layer of wet material, or

sludge, is deposited by the feeding mechanism B. Any selected portion of such layer is hence allowed to dry only during the interval between the time of its deposit and the return of mechanism C. By means of the construction of my improved table, I find that I am not only able to obtain maximum drying efliciency from the heating me dium employed, but also to render such heating uniform throughout the entire circumference of the table. This is highly important, for otherwise, a single ineffective section would retard the operation of the whole machine.

Other modes of applying the principle of my invention may be employed insteadof the one explained, change being made as re gards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 1. In drying mechanism, an annular drying table comprising a'seriesofi contiguous hollow sections; and independent connections for supplying a heating medium to said sections respectively; and means for controlling the flow of such heating medium to each of said sections.

2. In drying mechanism, an annular drying table comprising a series of contiguous hollow sections; independent connections for supplying a heating medium to said sections, respectively; means for controlling the flow of such heating medium through said c011 nections; and other independent connections for removing the water of condensation fromsaid sections, respectively. l r

3. In drying. mechanism, an annular dry- .ing table comprising aseries of contiguous hollow sectors, the bottom walls of said sectors inclining, on radial lines; connections tors inclining toward the central axis of they table; connections for supplying steam to said sectors; and other connections, leading from the inner ends of said sectors, for removing water of condensation therefrom.

5. In drying mechanisnnan annular drying table comprising a series of contiguous hollow sectorshavmg series of spaced radially extending webs; a header located at the central axis of said table; .independent radial connections from said header to the several sectors for supplying a heating medium thereto and valve means in each such connection forcontrolling the flow of the heating medium. f

6. In drying mechanism, an annular drying table comprising a series of contiguous hollow sectors, thebottom walls. of said sectors inclining toward the central axis of the table; two headers located at the centralv axis of said table; and pairs of radial connections extending from said headers to theseveral sectors, the ones for supplying steam thereto and the others, connected to the inner ends of the sectors, for removing water of condensation. i

7. In drying mechanism, an annular drying table comprising a series of contiguous hollow. sectors, the bottom walls of said sectable; two headers located at the central axis 30 of said table; pairs of radial connections exheating efiect of each said sector independtending from said headers to the several secently. 10 tors, one connection of each pair being Signed by me, this 2nd day of August, adapted to supply steam to a sector and the 1915.

other being connected to the inner end of the WILLIAM R. MACKLIN D. sector, for removing Water of condensation; Attested layand a valve mounted in each of said steam A. D. SOHRADER,

supplying connections for controlling the W. J. CRITOHLEY.

(Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Petenta, Washington, D. 13. 

